The incredibly rude act of walking up to a person while they ar engaging in something private, like a phone call, and just standing there waiting for them to turn and address you, even though they are obviously projecting the feeling of, "could you please step the fuck away, so I can finish my obviously private phone call!"

I was talking to a valued friend about the difficulties in dealing with life's problems, while at the same time trying to effeciently do one's job, and this snot-nosed Intern just walked up behind me, and was commiting the act of hoverage